I wanted to mention that I saw similar problems when I was supporting 1Password users who upgraded to Leopard. It seems that it may happen if you Upgrade (not Archive and Install). One of our users went to Apple store and was recommended to perform clean install to fix this issue.
There is also discussion on Apple forums, but I do not think they found any other solution:
http://discussions.apple.com/thread....tart=0#5797561